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THE ARM and HUMERUS

The arm is that portion of the upper extremity which is situated between the shoulder and the elbow. Its skeleton consists of a single bone, the humerus.

The HUMERUS

The Humerus is the longest and largest bone of the upper extremity; it presents for examination a shaft and two extremities.
The Upper Extremity presents a large, rounded head, joined to the shaft by a constricted   portion, called the neck, and two other eminences, the greater and lesser tuberosities.
The head, nearly hemispherical in form/ is' directed upward, inward, and alittle backward, and articulates with the glenoid cavity of the scapula; its surface is smooth and coated with cartilage in the recent state. The circumference of its articular surface is slightly constricted, and is termed the anatomical neck, in con­tradistinction to the constriction which exists below the tuberosities. The latter is called the surgical neck, from its often being the seat of fracture.

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